Swift Conf 2023: Keeping Swift Apps small

1. Why do we care?

• In the 90s: high optimizations
• Today: great experiences! But really?
• Developed vs emerging markets
• 85% of the population care about app size
• Install size != download size

2. How do we track it?

• App Size CI Checks like Emerge give you the power to block changes like + 12.4 MB
• Policies & Guidelines

3. How do we improve it?

• Delete everything hehe

Resources:

• SVG for small icons
• HEIC for the rest
• Minimize JSON
• Audio CAF + AAC
• Use Asset Catalog

Swift:

• Improper usage of Structs, like nesting types is expensive, reference types in structs, mutability in Structs
• Unused code: unnessesary dynamic dispatch, only add protocols to structs if needed

• Start Simple